private void buttonNotListen_Click(object sender, EventArgs e)
        {
            MachineLocal.Close();

            buttonListen.Enabled    = true;
            buttonNotListen.Enabled = false;
        }
        private void buttonClose_Click(object sender, EventArgs e)
        {
            MachineTarget.Close();

            buttonDisconnect.Enabled = false;
            buttonConnect.Enabled    = true;

            isTargetValid = false;;
        }